Introduction to common pump terms (6) – Pump cavitation theory

Cavitation of Pump: Theory and Calculation

Nānā nui o ka cavitation phenomena
ʻO ke kaomi o ka wai hoʻoheheʻe ʻia ke kaomi ʻana o ka wai (saturated vapor pressure). Pili ke kaomi vaporization o ka wai me ka mahana. ʻO ke kiʻekiʻe o ka mahana, ʻoi aku ka nui o ke kaomi vaporization. ʻO ke kaomi vaporization o ka wai maʻemaʻe ma ka lumi wela o 20 ℃ he 233.8Pa. ʻOiai ʻo ke kaomi vaporization o ka wai ma 100 ℃ ʻo 101296Pa. No laila, hoʻomaka ka wai maʻemaʻe ma ka lumi wela (20 ℃) ​​i ka mahu ke hāʻule ke kaomi i 233.8Pa.
Ke hoʻemi ʻia ke kaomi o ka wai i ke kaomi vaporization ma kahi mahana, e hoʻopuka ka wai i nā ʻōpū, i kapa ʻia ʻo cavitation. Eia naʻe, ʻaʻole mahu loa ka mahu i loko o ka ʻōhū, akā loaʻa pū kekahi i ke kinoea (ka nui o ka ea) ma ke ʻano o ka dissolution a i ʻole nucleus.
Ke hoʻopuka ʻia nā ʻōhū i ka wā o ka cavitation e kahe i ke kaomi kiʻekiʻe, e emi ana ko lākou leo ​​a pohā. Ua kapa ʻia kēia ʻano o ka nalo ʻana o nā ʻōpū i loko o ka wai ma muli o ka piʻi ʻana o ke kaomi.

ʻO ke ʻano o ka cavitation i ka paila
Ke hoʻohana ʻia ka paila, inā ʻo ka ʻāpana kūloko o kāna ʻāpana overflow (maʻamau ma kahi ma hope o ka puka komo o ka impeller blade). No kekahi kumu, i ka wā e hāʻule ai ke kaomi piha o ka wai i hoʻomoʻa ʻia i ke kaomi vaporization i ka mahana o kēia manawa, hoʻomaka ka wai e vaporize ma laila, e hoʻohua ai i ka mahu a hana i nā ʻōpū. Ke kahe nei kēia mau ʻōhū i mua me ka wai, a i ka wā e hiki ai lākou i kahi kaomi kiʻekiʻe, ʻo ka wai kaomi kiʻekiʻe a puni nā ʻōhū e hoʻoikaika i nā ʻōhū e emi ʻoi loa a pohā. Ke pohā ka ʻōhū, e hoʻopiha nā ʻāpana wai i ka lua i ka wikiwiki kiʻekiʻe a hui pū kekahi me kekahi e hana i ka hāmare wai. E hoʻopōʻino kēia ʻano ʻino i nā ʻāpana o kēia manawa ke kū ʻia ma ka pā paʻa.
ʻO kēia kaʻina kaʻina hana cavitation pump.

Ka hopena o ka pume cavitation
Hoʻopuka i ka walaʻau a me ka haʻalulu
Poino poino o na mea i oi aku o keia manawa
Hoʻohaʻahaʻa hana